How to seamlessly encrypt data for DROPBOX?

I pretty much like DROPBOX (and the security of having the data stored on Amazon's Cloud Network).
The file handling is very easy (like using Windows File Explorer), the UI is simple and plain...
The only thing missing (for me) is the possibility to ENCRYPT data BEFORE they leave my PCs to the Internet.
WUALA seems to overcome this problem, but I never tried this software - it has other significant shortcomings.
I'm looking for an EASY way to secure/encrypt all files that I drop into C:\DROPBOX\My Dropbox\PrivateShare.
Is there a small tool that does the job seamlessly, without even having to explicitely say "Encrypt this file now..."??? BR
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Have you looked at TrueCrypt?

You can create a virtual encrypted disk on your Dropbox and mount it as a new partition locally.

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